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Piero Sraffa’s Gesticulation.

The following quote relays an anecdote with regards to Piero Sraffa and his influence upon Ludwig Wittgenstein. I’ve hear of a similar story in which Wittgenstein was supposedly sent into a tailspin over a cyclist’s contemptuous gesture that he felt belied his work in the “Tractatus Logico Philosophicus”. Anyways, here it is: “Wittgenstein was insisting that a proposition and that which it describes must have the same 'logical form', the same 'logical multiplicity', Sraffa made a gesture, familiar to Neapolitans as meaning something like disgust or contempt, of brushing the underneath of his chin with an outward sweep of the finger-tips of one hand. And he asked: 'What is the logical form of that?'” -Norman Malcolm. Ludwig Wittgenstein: A Memoir. pp. 58–59.

Perhaps I’m mistaken, but Sraffa’s gesture to Wittgenstein is not a proposition. By definition, a proposition is a statement that functions as a truth-claim. Sraffa’s gesture is more akin to a negation and therefore a classic Wittgensteinian logical constant. No?

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I was looking through Robert Vienneau's blog "Thoughts on Economics" in which he has a post on he same issue. Though, like me, his quote is second hand, he offers more of it.

"Wittgenstein and P. Sraffa, a lecturer in economics at Cambridge, argued together a great deal over the ideas of the Tractatus. One day (they were riding, I think, on a train) when Wittgenstein was insisting that a proposition and that which it describes must have the same 'logical form', the same 'logical multiplicity', Sraffa made a gesture, familiar to Neapolitans as meaning something like disgust or contempt, of brushing the underneath of his chin with an outward sweep of the finger-tips of one hand. And he asked: 'What is the logical form of that?' Sraffa's example produced in Wittgenstein the feeling that there was an absurdity in the insistence that a proposition and what it describes must have the same 'form'. This broke the hold on him of the conception that a proposition must literally be a 'picture' of the reality it describes." --Norman Malcolm (1966). Ludwig Wittgenstein: A Memoir. Oxford University Press: 69

Anyways, it seems as if it wasn't the logical form or lack of in Sraffa's gesture but an idea that it sparked.

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